LOLIN C3 Mini

Development Board

Code name: LOLIN_C3_MINI

ESP32C3 WEMOS

LOLIN C3 Mini is a development board based on the ESP32C3 microcontroller using RISCV32 architecture.

This board features a maximum CPU frequency of 160 MHz and 4MB flash memory.

About LOLIN C3 Mini

Tiny ESP32-C3 board from Wemos with USB-C - ideal for compact, low-power IoT projects with Wi-Fi and BLE 5.

Technical Specifications

Complete technical specification details for LOLIN C3 Mini

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

Microcontroller

Model esp32c3

Clock Speed 160 MHz

Flash Size 4MB

Architecture riscv32

✨ Features & Pins

Digital IO 22

Analog Input 6

Interrupts 22

Download Full Datasheet

Quick Setup

Copy-paste configs for LOLIN C3 Mini - auto‑generated from this board's exact hardware specs.

ESP32C3 160 MHz 4MB DIO RISC-V

In Arduino IDE 2 select Lolin C3 Mini from the esp32 by Espressif package. In PlatformIO use board = esp32-c3-devkitm-1. ESP32C3 · 160 MHz · 4MB · DIO · RISC-V.

Tools menu settings

Board (select in Arduino IDE) Lolin C3 Mini

CPU Frequency 160 MHz

Flash Size 4MB

Flash Mode DIO

Upload Speed 921600

Architecture RISC-V

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Lolin C3 Mini" for the LOLIN C3 Mini.

platformio.ini


[env:lolin_c3_mini]
platform  = espressif32
board     = esp32-c3-devkitm-1
framework = arduino

; Exact hardware config for LOLIN C3 Mini
board_build.mcu        = esp32c3
board_build.f_cpu      = 160000000L
board_build.flash_size = 4MB
board_build.flash_mode = dio
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: arduino   # or "esp-idf"

# LOLIN C3 Mini - 160 MHz ESP32C3
# Flash: 4MB | USB: N/A

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32c3 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 4MB \
    0x0 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x0

LOLIN C3 Mini Pinout Diagram

Complete pin reference for LOLIN C3 Mini

Useful Links

Datasheets and resources for LOLIN C3 Mini

Board Datasheet

Technical specifications

ESP32C3 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for LOLIN C3 Mini

Digital I/O Pins

Interrupt Pins

Analog Inputs

Pin	Analog	Other
0	A0
1	A1
2	A2	SCK
3	A3	MISO
4	A4	MOSI
5	A5	SS
7		LED_BUILTIN
8		SDA
10		SCL
20		RX
21		TX

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for LOLIN C3 Mini

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x0`
Flash mode	dio
Boot mode	qio
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)